Apparatus for linear transmitter with improved loop gain stabilization
AssigneeMotorola, Inc.
InventorsMoshe Ben-Ayun, Mark Rozental
Life of this patent
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Abstract
A device for linear transmitter (150) with improved loop gain stabilization. The linear transmitter (150) includes a main amplifier loop (178) and an auxiliary loop (176). The device includes an adjustable device (159), connected within the main amplifier feedback loop (178) and further connected to the auxiliary loop (176). The adjustable driver (159) receives an input signal from main amplifier feedback loop (178), amplifies it in accordance with a gain control signal received from the auxiliary loop (176) and provides the amplified signal to main amplifier feedback loop (178).
Claims8
A device for minimizing performance degradation of a linear transmitter block of a radio communication device in the presence of antenna interference, the linear transmitter block including a main amplifier closed feedback loop to control gain and linearity of a radio frequency (RF) power amplifier and an auxiliary loop comprising an isolator eliminator to compensate at baseband for antenna load variations on the RF power amplifier, and an upconverter for converting baseband signals into radio frequency signals, the device comprising the RF power amplifier having an adjustable driver arranged to receive from said upconverter an input signal which includes a component from said main amplifier feedback loop and to receive a gain control signal from said auxiliary loop, the adjustable driver being coupled between the upconverter and the amplifier for causing said amplifier to be operable to amplify said received input signal according to said gain control signal and to provide an amplified output signal a portion of which is provided in operation to said main amplifier feedback loop for generating the component included in the input signal from the upconverter.
A linear transmitter block of a radio communication device, said linear transmitter block comprising a main amplifier closed feedback loop to control gain and linearity of a radio frequency (RF) power amplifier and an auxiliary loop comprising an isolator eliminator to compensate at baseband for antenna load variations on the RF power amplifier, an upconverter for converting baseband signals into radio frequency signals, and a device for minimizing performance degradation of the linear transmitter block in the presence of antenna interference, said device for minimizing performance degradation comprising the RF power amplifier having an adjustable driver arranged to receive from said upconverter an input signal which includes a component from said main amplifier feedback loop and to receive a gain control signal from said auxiliary loop, said amplifier being operable to amplify said received input signal according to said gain control signal and to provide an amplified output signal a portion of which is provided in operation to said main amplifier feedback loop for generating the component included in the input signal from the upconverter.
Dependencies are inferred from the claim text.